Revision of C618 - 12a Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

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1. Rationale

Current practice is for coal-fired power plants to include materials other than coal in the fuel stream, although the fuel stream is primarily and predominately coal. These other materials are added to modify combustor operation. The intent of this ballot is to modify ASTM C618 to reflect this common practice by clarifying the definition of coal fly ash.